MIVEC tuning
Aug 19, 2009, 03:25 AM
#610
Aug 19, 2009, 11:31 AM
#611
I played around (went negative) with exhaust cams on some HKS280s on an VIII and didnt see any gains, only losses. If the cams are properly engineered the cam gears shouldnt need to be used. That being said on my 4G64 I have to have an exhaust cam gear because of the increased deck height so I will have a reason to mess around with them. I dont want to sound like you wont find gains, I have never combined with a IX and MIVEC before. One thing about messing with the exhaust cam is you are also altering the ECU timing reference when you do that.
Aug 19, 2009, 11:54 AM
#612
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I played around (went negative) with exhaust cams on some HKS280s on an VIII and didnt see any gains, only losses. If the cams are properly engineered the cam gears shouldnt need to be used. That being said on my 4G64 I have to have an exhaust cam gear because of the increased deck height so I will have a reason to mess around with them. I dont want to sound like you wont find gains, I have never combined with a IX and MIVEC before. One thing about messing with the exhaust cam is you are also altering the ECU timing reference when you do that.
Next one didn't gain anything, the one after that about 3-5whp
Aug 19, 2009, 07:13 PM
#614
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MIVEC never "quits", it's always working. There are no significant increases of power by adding timing at the higher portions of the maps, rather you want to aim to zero out.
Aug 19, 2009, 08:46 PM
#615
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I understood increasing mivec timing above 6k rpms as helping to hold power to redline in some cases, even though it doesn't "increase" power.